IMO its the sealant which is the good bit, I did it cuz of thorn punctures. Havent had one since I switched.
I dont really care about weight and TBH havent noticed a difference in that or grip. Only gone down once but it blew back up and resealed.
I use 819 rims and Bonty tubeless tyres. Blow straight up no probs.
Lack of UST tyres is a bit rubbish, Ive also used Stans strips and normal tyres on UST rims, they area faff to blow up first few times but you do learn how to do it.
Its not one for serial tyre switchers.